Materials Literature
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The polaron concept is used to describe trapping of charge in a dielectric medium. It is shown that trapping is associated with defects identified as being due to a local decrease of the electronic polarizability. The polarization energy around a charge is estimated, using a self-consistent calculation of the local fi…
Two approaches were postulated for improving the stability of porous texture of titania membranes: (1) retarding the phase transformation and grain growth; (2) avoiding the phase transformation. Based on the second approach, rutile membranes were made directly from a rutile sol, prepared by the precipitation of titani…
Kim Orchard, Gillian E. May; An EMSA-based method for determining the molecular weight of a protein - DNA complex, Nucleic Acids Research, Volume 21, Issue
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-liquid equilibria of water + acetic acid + phthalic esters (dimethyl phthalate and diethyl phthalate) ternariesUmur Dramur and Besir TatliCite this: J. Chem. Eng. Data 1993, 38, 1, 23–25Publication Date (Print):January 1, 1993Publication History Published online1 May…
The formation of ferroelectric liquid crystals by simple dipolar models is investigated using density-functional theory and absolute-stability analysis. It is emphasized that for such systems well-defined results can only be found by specifying exactly how the long-range dipolar interactions are treated. Explicit form…
Spatially resolved electron energy-loss spectra have been recorded from the same E = 11 grain boundary of a high purity sapphire (α - Al 2O3) bi-crystal that had previously been examined by high resolution electron microscopy. The energy-loss near-edge structure (ELNES) on the aluminium L2,3 edge of the bulk α - Al2O3…
The mixed-valence complex [Cu2L]3+1[L ={N[CH2CH2N(H)CH2CH2N(H)CH2CH2]3N]} has been shown from EPR, visible Spectroscopic, and single-crystal X-ray diffraction measurements to possess an unpaired electron delocalized over a short Cu(1.5)–Cu(1.5) bond in both the hydrated nitrate [2.364(2)Å] and acetate [2.415(2)Å] salt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformations and order in atactic poly(vinyl chloride) melts from molecular dynamics simulationsGrant D. Smith, Richard L. Jaffe, and Do Y. YoonCite this: Macromolecules 1993, 26, 2, 298–304Publication Date (Print):January 1, 1993Publication History Published online1 May 20…
The Π-A isotherms at the air-water interface and 25°C for monomolecular films of the recently synthesized dendrimer surfactants are reported and compared with those of polystyrene terminated with a single hydroxyl group. There is a strong dependence of the isotherms on molecular weight (MW) for both systems, the lower…
The synthesis of eight derivatives of a 26π-electron macrocycle analogous to the porphyrins bearing six pyrrole rings and six methine bridges is described. This chromophore is named hexaphyrin. Owing to the flexibility of their chromophore, hexaphyrins are able to form two kind of binuclear coordination complexes of s…
Model polymers for materials science, L.J. Fetters, E.L.Thomas amorphous polymer microstructure, F.T. Gentile, U.W. Suter structure of polymer single crystals, B. Lotz, J.-C. Wittmann crystallization and morphology of semicrystalline polymers, P.J. Barham structure of liquid crystalline polymers, M. Ballauff structure…
Cu is receiving increasing attention as a replacement for Al in future Si ultra-large-scale integrated circuits due to its lower resistivity and potentially better reliability in terms of electromigration resistance and stress-induced voiding. Metalorganic chemical vapor deposition (MOCVD) of Cu offers the advantages…
Novel starburst molecules based on π-electron systems, 1,3,5-tris[4-(diphenylamino)phenyl]benzene and its methyl-substituted derivatives, have been synthesized and found to constitute a new family of amorphous molecular materials with high glass-transition temperatures above 100°C.
Abstract This paper is a review of our work on nanocrystalline semiconductor films which exhibit pronounced size quantization effects in three dimensions, manifested by large blue‐shifts in their optical absorption spectra. The films are prepared by either chemical solution deposition (CdSe and PbSe) or by electrodepo…
The effects of sintering time and rate of cooling on the microstructure and current/voltage characteristics of a ZnO varistor material have been investigated. The results provide information about the development of microstructure during sintering and have been interpreted in terms of the role which microstructure pla…
We report on the fabrication of novel refractive microlens arrays in photoresists, in particular on lenses with numerical apertures ranging from 0.1 to 0.3. A base layer technique is described that makes it possible to fabricate lower numerical aperture lenses in resist, compared with microlenses on glass substrates.…
The biphenylyl esters of the 4-n-alkoxyphenylpropiolic acids are a unique family of liquid-crystalline materials. In particular, when the biphenyl moiety of the compounds carries a chiral end-group, many optically active mesophases are created which exhibit unusual structures and physical properties. For instance, whe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFerromagnetic exchange coupling and magneto-structural correlations in mixed-bridged trinuclear copper(II) complexes. Magnetic data and theoretical investigations and crystal structures of two angled CuII3 complexesStefan Gehring, Peter Fleischhauer, Helmut Paulus, and Wolfg…
Results of the drift hole mobility in strained and unstrained SiGe alloys are reported for Ge fractions varying from 0 to 30% and doping levels of 10/sup 15/-10/sup 19/ cm/sup -3/. The mobilities are calculated taking into account acoustic, optical, alloy, and ionized-impurity scattering. The mobilities are then compa…
The coefficient of thermal expansion (α), Young’s and rigid moduli (E and G), Poisson’s ratio (ν), compressive yield and fracture strengths (σy and σf), fracture toughness (K), Vickers hardness (Hv) and cleavage fracture mode were examined along two-, three- and five-fold symmetry axes for an Al70Pd20Mn10 single-quasi…